Micrometric printing-film-frame apparatus.



B. DAY.

MIGROMETRIO PRINTING FILM FRAME APPARATUS.

APPLICATION PILED APR.19, 1910.

1,031,627; I Patented July 2, 1912.

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B. DAY. MIGROMETRIG PRINTING PILM FRAME APPARATUS.

APPLIOATION FILED APR. 19, 1910.

Patented July 2, 1912.

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B. DAY.

MIGROMETRIG PRINTING FILM FRAME APPARATUS. APPLICATION FILED APR.19, 1910.

1,031,627. Patented Jul 2, 1912.

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BENJAMIN DAY, OF SUMMIT, NEW JERSEY, ASSIGNOR TO BEN. DAY, INC., A CORPORATION OF NEW JERSEY.

MICROMETRIC PRINTING-EILM-FRAME APPARATUS.

To all whom it may concern Be it known that I, BENJAMIN DAY, a citizen of the United States, and a resident of Summit, Union county, New Jersey, have invented certain new and useful Improvements in Micrometric Printing-Film-Frame Apparatus, of which the following is a specification.

My invention relates to micrometricprinting-film frame apparatus, by means of which printing films are used for shading drawings on paper, zinc, copper, and the like, such apparatus including a printingfilm frame having various movements and adjustments with relation to the printing surface.

The improvements constituting my invention are shown applied to that form of such apparatus in which a plane support is used to carry the drawing or metal plate or stone, and carriages are used, which are detachably secured to the plane support and in turn support a cross-rod from which the film frame is supported by intermediate devices. However, the improvements, with the exception of those which relate directly to these carriages, are equally applicable to the hold-fast type of apparatus, such as shown in Patent No. 7 83,823, date February 28, 1905, for example.

The present invention consists largely in improvements on the means for holding and effecting lnicrometric adjustment of the film frame illustrated in my Patent No. 818,867, dated February 27, 1906.

One object of my invention is to provide improved means for miorometrically adjusting the film frame, so as to finer adjustment.

Another object is to provide improved locking means for insuring against loss of register, such locking means including improved construct-ions whereby shafts, rods and pintles and their bearings may be locked quickly and absolutely against relative movement, but may be readily released and permitted to move relatively to each other without any binding or jamming. In one particular form, this object is accom- Specification of Letters Patent.

Patented July 2, 1912.

Application filed April 19, 1910. Serial No. 556,351.

plished by providing improved holding means for the cross-rod, which holding means insures an absolutely firm grip upon the rod, irrespective of jar or wear, and prevents the rod being rotated in its bearings when the carriages thereon are adjusted angularly around the rod.

A further object is, in the plane support type of apparatus, to so construct the carriages which are secured to the plane sup port, that they will not become accidentally detached therefrom.

With these and other objects in view, my invention consists in the parts, improvements and combinations more fully pointed out hereinafter.

Referring to the drawings: Figure 1 is a perspective view of an apparatus of the plane support type, embodying the present improvements; Fig. 2 is a perspective view of one of the carriages that are mounted on the longitudinal guide flanges at the sides of the plane support; Fig. 3 is an inner side elevation of the carriage, partly broken away, showing the crossrod in section; Fig. 4-. is a vertical transverse section through the right lateral margin of the support, the guide flanges secured thereto, and the carriage mounted on the flange, a portion of the rod being shown in elevation; Fig. 5 is a plan view of the central portion of the cross-rod, and the carriages, pintle holders, and pintles carried thereby, together with the means for adjusting and locking the same, the parts at the right of the view being partly in horizontal sect-ion; Fig. 6 is a sectional elevation, taken on the line 66 of Fig. 5; Fig. 7 is a front elevation of the right hand carriage, pintle holder, and

pintle, and the adjusting and locking means 7 associated therewith; Fig. 8 is a sectional plan on an enlarged scale of the parts shown at the right of Fig. 5 for effecting adjustment of the pintle holder forward andbackward; Fig. 9 is an enlarged sectional view, taken on the line 9-9 of Fig. 6; Fig. 10 is a sectional view taken on the line 10-10 of Fig. 5; and Fig. 11 is a detail sectional view taken on the line 11 of Fig.6.

In these views, and referring for the present, more particularly to Figs. 1 to 4, inclusive, the numeral 2 indicates a plane support, adapted to receive a zinc or copper plate, stone, drawing paper, or the like, tobe shaded. Longitudinal guide flanges 3 are secured to the sides of this support; and mounted for movement lengthwise on these guide flanges are carriages 4, which can be adjustably secured thereto. The said guide flanges and carriages are constructed to prevent accidental displacement of the carriages, so that they cannot be lost or detached from the support. As shown, the carriages and guide flanges have interlocking portions so as to prevent movement other than the lengthwise movement of the carriages just referred to and to prevent the carriages from becoming detached from the support. In the preferred construction, each flange 3 consists of an upright inner wall 5 secured to the support 2, as by screws G, a top wall 7, and an outer depending lip 8. Preferably, also, each carriage 4 has portions 9 and 10 embracing the top and bottom of the corresponding guide flange 3, and upstanding retaining portions, shown as studs 11, received behind the lip 8. However, these particular constructions may be varied. One or more locking screws 12 serve to clamp the carriage 4 to the guide flange, thus locking the carriage against lengthwise movement. Suitable means are provided for limiting the length wise movements of the carriages. To accomplish this result, I provide stops 14 within the longitudinal channel 18 formed in the under part of the guide flange 3. As shown, these stops, which contact with the studs 11, may be in the nature of screws threaded through the top wall 7 of the guide flange 3. A post 15 is mounted for vertical movement in each carriage 4 and may be locked by a screw 20. Said post is provided with a horizontal aperture 16. The cross-rod 17 is held in these apertures. Suitable means are provided for locking the rod against rotation, thereby insuring against accidental displacement of the film frame and film as they are turned up for inspection. of the work, and also insuring against rotation of the rod and consequent shift-ing of the frame by jar or wear and by necessary manipulation in the operation of the apparatus. As will presently be described,

micrometric adjusting devices are provided for adjusting the film accurately and delicately; and, when the fllm and its frame are turned up to inspect the work, or when the carriages are rotated slightly angularly on the rod, it is absolutely essential that this delicate adjustment be preserved, as otherwise the requisite absolute register between the design carried by the film and the work would be lost. I therefore form opposite walls of the apertures 16 as converging bearing surfaces 18 which are comparatively long transversely of the shaft. Locking screws 19 serve to force the rod 17 against these bearing surfaces, whereby the rod is held with absolute rigidity, irrespective of the actions heretofore referred to, and irrespective of wear which gradually lets the rod down to new bearings worn by use but does not affect the action of the set screw in clamping the rod against the converging planes of contact.

In the best embodiment of the invention, the bearing surfaces 18 form portions of two sides of an equilateral triangle, the third side being completed by a base line passing through the point of cont-act between the screw 19 and the rod 17 tangentially of the rod. The angle between the sides 18 is substantially sixty degrees. I have found that this angle or substantially this angle is the one best adapted to hold the rod 17 firmly and rigidly against rotation. When the set screw 19 is loosened, the rod 17 may be freely pushed through the bearings. hen the screw is screwed down against the rod, the bearing for the rod holds it with exceeding firmness. The head of the screw 19 has a quick operating lever 21 secured rigidly thereto, and is also provided with a stop 22, cooperating with a stationary stop 28, to limit the screw to a part revolution, whereby the screw may be quickly and readily operated and is confined against removal.

Spaced carriages 24 are mounted slidably on the rod 17, each carriage having spaced bearing portions or collars 25 encircling the rod. As shown in Fig. 9, the circular bearings formed in these bearing portions are enlarged or broached at a plurality of regions, leaving a plurality of narrow, longitudinal bearing surfaces 26. Particularly desirable results are obtained by providing three of these bearing surfaces, arranged in triangular relation to each other and equidistant. A locking screw 27 is threaded through each carriage at the inner side of an upward projecting casing or box 28 thereon, said screw being located in alinement with one of the longitudinal bearing surfaces 26 and equidistant from the other two, whereby, when its point is forced against the rod 17, the carriage is locked thereon immo-vably, but when the screw is released the carriage may be moved freely on the rod without check or amming. The head of each screwhas a quick operating lever 29 secured rigidly thereto and extending rearward. In accordance with the invention the screws of the two carriages are right and left threaded, respectively, whereby both levers 29 are moved forward to lock the screws against the rod. The unlocking movement is limited by the levers contacting with the opposed inner side of the casings 28, thus preventing the screws from becoming detached and lost. The carriages 24 constitute supports for the parts carried thereby. A pintle holder 30 is mounted to slide backward and forward, transversely of the rod 17, on each carriage 24, sliding on bearing surfaces 31 and 32 on the casing 28, which is rigidly secured to the carriage 24. Each pintle holder 30 has a rearward extending nut member 33, which slides on the top of the carriage 24.

Improved means are provided for effecting micrometric adjustment of the pintle holder 30 backward and forward on its carriage. A shaft 34 is disposed transversely of the rod 17, and. is journaled near its ends in bearings 35 and 36 in the front and rear walls of the casing 28, respectively. This shaft is provided intermediate its journals with a threaded portion 37 engaging with the threaded portion 38 of the nut member 33. In accordance with the invention, the nut member 33 has bearings 39 and 40 encircling the unthreaded portions of the shaft 34 at opposite sides of the threaded portion 37. This feature is of great importance, since it relieves the threads of the shaft and nut member of all lateral strain, thus contributing in considerable measure to the preservation of exact adjustment which constitutes the general object of this invention.

The bearings 39 and 40 are of larger and smaller diameter, respectively, and receive larger and smaller diameters 41 and 42 of the shaft. By the provision of the two bearings at opposite sides of the screw threads, I am also enabled to make the threaded portions 37 and 38, of the shaft and nut member, short, thus greatly reducing friction. The threaded portion 37 of the shaft is of greater diameter than the shaft part 42 on which these threads are formed; and the threaded portion 38 of the nut member is of less diameter than the cylindrical portions of the bore at opposite sides of this threaded portion. The bearings 39 and 40 are spaced from the short threaded portions 37 and 38; and the threaded portion 38 is spaced from the shaft part 41 of larger diameter.

In accordance with the invention, the bearing 35 is a hollow cone thrust bearing, and in the best form of the invention it is formed in a removable threaded member 43 screwed into a threaded opening in the front wall of the casing 28, which threaded opening is large enough to permit the passage of the largest diameter of the shaft.

The bearing 36 may be a plain bearing.

The shaft 34 has formed thereon a cone journal 44, corresponding to the hollow cone bearing 35.

In the best form of the invention, the

bearing 40 is a removable collet bearing; against which bears a strong compression spring 45, which is coiled about the shaft part 42 between said collet bearing and the rear wall of the casing 28. This spring forces the threads of the nut member 33. against the threads of the shaft, and, in turn, forces the cone journal 44 against the cone bearing. The front part 47 of the shaft 34 is of a third diameter smaller than the diameter of either of the parts 41 and 42, and has a micrometric adjusting head 46 rigidly secured thereto. The cone journal 44 connects these two shaft parts 41 and 47. As in my prior patents alluded to, one of the two opposed, pointed pintles 48, 49, which support the film frame 50 tiltably, through suitable intermediate means 51, is spring projected. Preferably, this is the left hand pintle 48, which is shown as encircled by a coiled spring 52 confined between a collar 53 on this pintle and one of the spaced depending pintle-bearing portions 54 on the carriage 24. The right hand pintle 49 is provided with improved means for adjusting the same micrometrically and holding it as adjusted. As in the case with the other pintle, this pintle 49 is slidably mounted inbearings formed in the spaced depending bearing portions 54. The rear end of this pintle is threaded, as indicated at 55, well away from the adjacent bearing, so that there will be no danger of the threads entering the bearing. A micrometric adjusting head 56, having internal screw threads, engages this threaded portion 55 of the pintle. On one half, more or less, of the periphery of this head are formed graduations 57, and on the other half of the periphery, worm teeth 58, constituting the adjusting head a worm wheel. By this means, the graduations are plainly visible. A worm 59, journaled in a bracket extending forward from the pintle holder 30, engages these worm teeth, and has a manipulating handle or head 61 at its front end, where it may be conveniently operated. By means of the worm and worm gear, the pintle 49 may be adjusted with comparative quickness and with the greatest exactness.

As in my prior patents referred to, the threads of the pintle 49 and the head 56 are forced together, to take up blacklash, by a strong spiral spring 62. According to the present invention, this spring is confined between the outer bearing portion 54 and a bearing block 63 secured rigidly to the pintle. This block has a fiat top surface 64 which travels along a flat bearing surface 65 connecting the spaced bearing portions 54, thus steadying the pintle and holding it against rotation. This block also serves as a stop member, cotiperating on the one hand with the inner bearing portion 54, and on the other hand with a sleeve 66, which incloses the spring 62. If desired, a pin 67 as in my prior patents, may extend upward from the pintle 49 and be received in a slot 68 in the pintle holder 30.

The bearings of both pintles 48 and 49 are broached similarly to the bearings of the carriage bearing portions 25. One of the pintle bearings is illustrated in Fig. 10. Both pintles have locking screws 69, which are threaded through the inner bearing portions 54:. The end of each screw contacts with the side of its pintle in the longitudinal region of one of the narrow, longitudinal bearing surfaces 70. The screw of pintle 48 has a quick operating lever 71 secured thereto, this lever being arranged to contact with the inner side of the casing 28, to limit the screw to a part revolution, thus preventing the screw from being 'lost. The pintle screw 68 of the pintle 49 has two rigidly secured handles 71, one of which limits the locking and the other the unlock ing movement of the screw.

Having thus described my invention, what I claim as new, and desire to secure by Letters Patent, is:

1. In a micrometric printing-film frame holding and adjusting apparatus, the combination of a support, a shaft journaled in said support and provided with a threaded portion, a pintle holder slidable on said support and having a nut member engaging said threaded portion of the shaft, said nut member having spaced bearings encircling said shaft, whereby the threads of the shaft and nut member are preserved from all lateral strain.

2. In a micrometric printing-film frame holding and adjusting apparatus, the combination of a support, a shaft journaled in said support and provided with a threaded portion, a pintle holder slidable on said support and including a nut member engaging said threaded port-ion of the shaft, said nut member having bearings encircling said shaft at both sides of the threaded portion of the latter, whereby the threads of the shaft and nut member are preserved from all lateral strain.

3. In a micrometric printing-film frame holding and adjusting apparatus, the combination of a support, a shaft journaled at its end portions in said support and provided intermediately with a short threaded portion of greater diameter than the unthreaded portions of the shaft adjacent the opposite sides thereof, a pintle holder slidable on said support and including a nut member having intermediate its ends a short threaded portion, said threaded portion engaging the threaded portion of said shaft and being of less diameter than the unthreaded portions of the bore adjacent its opposite sides, said nut member having bearings encircling said shaft at opposite sides of and spaced from said threaded portions, whereby friction is minimized and the threads of said shaft and nut member are preserved from lateral strain.

4. In a micrometric printing-film frame holding and adjusting apparatus, the combination of a support, av shaft journaled in said support, said shaft having two diameters and having also a threaded portion, a.

pintle holder slidable'on said support and including a nut member engaging said threaded portion, said nut member having bearings of two diameters at opposite sides of the threaded shaft portion.

5. In a micrometric printing-film frame holding and adjusting apparatus, the combination of a support, a. shaft journaled in said support, said shaft having two diameters and being further provided with a short threaded portion formed on its part of smaller diameter and spaced from the part of larger diameter, a pintle holder slidable on said support and including a nut member provided internally with a short threaded portion engaging the threaded port-ion of the shaft, said nut member having bearings of two diameters encircling the shaft parts of two diameters at opposite sides of the threaded shaft portion.

6. In a micrometric printingfilm frame holding and adjusting apparatus, the combination of a support, a shaft journaled in said support, said shaft having two diameters and having also a threaded portion, a pintle holder slidable on said support and including a. nut member engaging said threaded portion, said nut member having bearings of two diameters encircling the shaft parts of two-diameters at opposite sides of the threaded shaft portion, the bearing of smaller diameter being a removable collet bearing, and an expansion spring coiled about the shaft part of smaller diameter between said collet bearing and said support.

7 In a micrometric printing-film frame holding and adjusting apparatus, the combination of a support having a hollow cone thrust bearing, a shaft having a corresponding cone journal received in said cone bearing, said shaft being further provided with a threaded portion, a pintle holder slidableon said support and including a nut member engaging said threaded portion, and an expansion spring coiled about said shaft between said nut member and said support at the side of the nut member remote from the cone bearing.

8. In a micrometricprinting-film frame holding and adjusting apparatus, the combination of a support having alined bearings, a shaft journaled in said bearings, one of said bearings being a hollow cone thrust bearing and the cooperating journal of the shaft being a corresponding cone, said shaft having a threaded portion intermediate its journals, a pintle holder slidable on said support and including a nut member engaging said threaded portion, and an expansion spring coiled about said shaft between said nut member and said support at the side of the nut member remote from the cone bearing.

9. In a micrometric printing-film frame holding and adjusting apparatus, the combination of a support having alined bearings,

a shaft journaled'in said bearings, one of.

said bearings being a hollow cone thrust bearing and the cooperating journal of the shaft being a corresponding cone, said shaft having a threaded portion, a pintle holder movable relatively to said support and including a nut member engaging said threaded portion, said nut member having bearings encircling said shaft at opposite sides of the threaded portion of the latter, and a spring coiled about said shaft and arranged to force the threads of said nut member against the threads of said shaft and the cone journal of said shaft against the said cone bearing.

10. In a micrometric printing-film frame holding and adjusting apparatus, the combination of a support having a rear bearing and a forward threaded opening, a removable threaded member received in said opening and having a hollow cone thrust bearing formed therein, a shaft journaled in said rear bearing and having a corresponding cone journal received in said cone bearing, said shaft having a threaded portion, a pintle holder movable relatively to said support and having a nut member engaging said threaded portion, and a spring arranged to force the threads of said nut member against the threads of said shaft and the said cone journal of said shaft against the said cone bearing.

11. In a micrometric printing-film frame holding and adjusting apparatus, the com bination of a support, a shaft having a threaded portion and being of three diameters, the part of least diameter being at the front end of the shaft and the part of greatest diameter being next in rear, and the parts of greatest and least diameter being connected by a cone journal, said support having a corresponding and removable cone bearing receiving said cone journal, and having also a rear bearing receiving the shaft part of medium diameter, a micrometric adjusting head secured to the shaft part of least diameter in front of said support, a pintle holder slidable on said support and having a nut member engaging the threaded portion of the shaft, said nut member having bearings encircling the shaft parts of greatest and medium diameter at opposite sides of the threaded portion of the shaft, the rear bearing being a collet bearing, and an expansion spring coiled about the shaft part of medium diameter between said nut member and the rear part of the support.

12. In a micrometric printing-film frame holding and adjusting apparatus, the combination of a support, spaced pintle holders carried thereby and provided with circular pintle bearings, opposed cylindrical pintles in said bearings, one of said pintles having resilient means for maintaining it projected, and the other pintle having micrometric adjusting means, locking screws threaded into both pintle holders and adapted to force said pintles against their bearings, quick operating levers secured rigidly to said screws, and stops which limit the movement of said screws to a part revolution.

13. In a micrometric printing-film frame holding and adjusting apparatus, the combination of a support, spaced pintle holders carried thereby and provided with circular pintle bearings, opposed cylindrical pintles in said bearings, one of said pintles having resilient means for maintaining it projected, and the other pintle having micrometric adjusting means, locking screws threaded into both pintle holders and adapted to force said pintles against their bearings, quick operating levers secured rigidly to said screws, and stops which limit the movement of said screws to a part revolution, the screw of the micrometrically adjustable pintle having two levers, arranged, respectively, to limit the locking and the unlocking movement of said screw.

1 In a micrometric printing-film frame holding and adjusting apparatus, the combination of a support, spaced pintle holders carried thereby, said holders having circular pintle bearings which are enlarged at a plurality of regions, leaving a plurality of narrow longitudinal bearing surfaces, opposed cylindrical pintles slidable in said bearings without hitch o-r jam, and locking screws threaded into said holders 'at the region of one of the longitudinal bearings and bearing against said pintles to force them against the other longitudinal bearings.

15. In a micrometric printing-film frame holding and adjusting apparatus, the combination of a cross-rod, a carriage slidable and lockable thereon, a pintle holder slidable on said carriage transversely of the rod, said holder having a circular pintle bearing e11- larged at three regions to leave three triangularly related narrow longitudinal bear ing surfaces, one thereof being equidistant from the other two, a cylindrical pintle slidable freely on said bearing surfaces without hitch or jam, and a locking screw having a handle portion and being threaded into said holder in the region of said equidistant longitudinal bearing surface and bearing at its end against said pintle to force the latter against the other two bear- A ing three or more narrow longitudinal transversely arcuate bearing surfaces disposed around the rod and permitting guided sliding movement between the rod and bearing without hitch or jam, and a locking screw threaded through-said member against said rod and adapted to force the latter againstpart of said bearing surfaces.

17 In a micrometric printing-film frame holding and adjusting apparatus, the combination of a tiltable and adjustable film frame, a cylindrical supporting rod, an elongated member provided with longitudinally spaced bearing collars encircling said rod, each of said collars being enlarged internally at a plurality of regions leaving three triangularly related narrow transversely arcuate bearing surfaces permitting free sliding movement between the rod and bearing without hitch or jam, and a locking screw threaded through said member between said collars in general alinement with a bearing surface of each bearing and adapted to force the rod against the other two bearing sur faces of each bearing.

18. In a micrometric printing-film frame holding and adjusting apparatus, the combination of tilt-able and adjustable frame, a supporting rod, a bearing member through which said rod passes, and a locking screw threaded through said bearing member against said rod and having a quick operating lever rigidly secured thereto, and a stop for limiting the movement of said screw to a part revolution, whereby the screw may not be lost.

19. In a micrometric printing-film frame holding and adjusting apparatus, the com' bination of a cross-rod, carriagesslidable thereon and having upward projecting portions, pintle holders slidably mounted on said carriages, pintles for tiltably supporting a film frame carried'by said holders in front of said rod, and locking screws threaded through said carriages at the inner sides of said upward projecting portions against said rod, said screws being oppositely threaded and having rearward extending quick operating levers secured rigidly thereto and arranged to abut against said upward projecting portions, to limit the unlocking movement, whereby both levers are movable forward to lock the carriages.

bination of a pintle holder having a pintle j bearing, a pintle slidably received in said bearing and having a threaded portion, aworm wheel having internal screw threads engaging said threaded portion, a, spring encircling said pintle and forcing the threads thereof against the threads of said worm wheel, and a worm journaled in said pintle holder, engaging said worm wheel, and having a manipulating handle.

21. In a micrometric printing-film frame holding and adjusting apparatus, the combination of a pintle holder having a pintle bearing, a pintle slidably received in said bearing and having a threaded portion, an internally threaded micrometer head engaging said threaded portion, said micrometer head having worm teeth formed about one side of its periphery and graduations on the other side thereof, whereby the graduations are plainly visible, a spring encircling said pintle and forcing the threads thereof against the threads of said micrometer head, and a worm journaled in said pintle holder, engaging said worm teeth, and having a manipulating handle.

22. In a micrometric printing-film frame holding and adjusting apparatus, the combination of a cross-rod, a carriage slidably mounted thereon, a pintle holder mounted to slide forward and backward on said carriage, micrometric adjusting means for said holder, a pintle disposed parallel to said rod and mounted slidably in said holder, said pintle having a threaded portion, a worm wheel having internal screw threads engaging said threaded portion, a worm journaled in said pintle holder, engaging said worm wheel and extending forward therefrom, and having a manipulating handle on its front end.

23. In a micrometric printing-film frame holding and adjusting apparatus, the combination of a pintle holder having a pintle bearing, a pintle slidably mounted therein and having its rear end threaded, an adjusting nuton said threaded end, a spring encircling said shaft and forcing the threads thereof against the threads of said nut, and stop means on said pintle arranged to limit the movement thereof in both longitudinal directions.

24;. In a micrometric printing-film frameholding and adjusting apparatus, the com bination of a pintle holder having spaced bearing portions and a bearing surface therebetween, a pintle holder slidable in said bearing portions and having athreaded portion, a stop block secured to said pintle and arranged to limit the longitudinal movement thereof, said block having a bearing face slidably contacting said bearing surface and preventing said pintle from turning, and an expansion spring encircling said pintle between said stop block and one of said bearing portions.

26. An apparatus for utilizing printingfllms'comprising the combination of a plane support, guide flanges at the sides thereof, carriages mounted on said guide flanges for movement lengthwise thereof, screws for locking said carriages to said flanges, said carriages and flanges being constructed with interlocking portions adapted to prevent the carriages from becoming detached from the support when said screws are loosened, and a printing-film frame supported from said carriages tiltably and adjustably with relation to said support.

27. In an apparatus for utilizing printing-films, the combination of a support, guide flanges thereon, carriages mounted on said guide flanges for movement lengthwise thereof, means for locking said carriages against lengthwise movement, a horizontal rod supported by said carriages, said carriages and flanges being constructed with interlocking portions adapted to prevent the carriages from becoming detached from the support when said locking means is released, other carriages mounted slidably on said rod, and a printing-film framemounted on the last-named carriages adjustably and tiltably with relation to said support.

28. In an apparatus for utilizing printingfilms, the combination of a support, guide flanges secured to the sides thereof and provided with angularly disposed lips, carriages having portions extending slidably over the tops and under the bottoms of said guide flanges and having retaining portions contacting with the inner sides of said lips, and a printing-film frame supported from saidcarriages to be raised to expose the printing surface.

29. In an apparatus for utilizing printing-films, the combination of a support, guide flanges secured to the sides thereof and provided with outer marginal downturned lips, carriages slidable lengthwise of said flanges, embracing the tops and bottoms thereof and having upstanding retaining portions received behind said lips, and a tiltable printing-film frame supported from said carriages.

30. In an apparatus for utilizing printing-fllms, the combination of a support, guide flanges at the sides thereof, carriages against detachment mounted on said guide flanges for movement lengthwise thereof, releasable means for locking said carriages against lengthwise movement, said carriages and flanges being constructed to have interlocking engagement so as to retain the carriages when said locking means are released, means for limiting the extent of such lengthwise movement, and a printing-film frame supported from said carriages andadapted to be raised to expose the printing surface.

31. In an apparatus for utilizing printing-films, the combination of a support, guide flanges secured to the sides thereof and provided with outer marginal downturned lips, carriages slidable lengthwise of said flanges, embracing the tops and bottoms thereof and having upstanding retaining portions received behind said lips, stop members for limiting the lengthwise movement of the carriages carried by said flanges behind said lips, and a tiltable printing-film frame supported from said carriages.

32. In an apparatus for utilizing printing-films, the combination of a support, guide flanges at the sides thereof, each consisting of an upright wall secured to the side of said support, a top wall, and a depending outer marginal lip, carriages slidable lengthwise of said flanges embracing the tops and bottoms thereof and having retaining portions received behind said lips, and a printing-film frame supported from said carriages to be raised to expose the printing surface.

33. An apparatus for utilizing printingfilms comprising the combination of a plane support, guide flanges at the sides thereof, carriages mounted on said guide flanges for movement lengthwise thereof, screws for locking said carriages to said flanges, said carriages and flanges being constructed with interlocking port-ions adapted to prevent the carriages from becoming detached from the support when said screws are loosened, posts mounted in said carriages and vertically movable therein and having enlargements above and below the carriages whereby the said posts cannot become displaced, a trans verse rod carried adjustably by said posts, and a printing-film frame supported from said rod tiltably and adjustably with re lation to said support.

84. In an apparatus for utilizing printing-films, the combination of a support, a pair of alinable bearings, a rod passing through said bearings and relatively adjustable therein, each bearing having its walls at opposite sides formed by comparatively long converging planes of contact, posts integral with each bearing; said posts being rotatable and adjustable as to bring the corresponding walls of the bearings into alinement and to move the bearings toward In testimony whereof, I have signed my and from the support, set screws bearing name to this speclfication, 1n the presence 01" agalnst the rod passing through the beart-W0 subserlblng Witnesses.

ings so as to hold the latter rigidly against BENJAMIN DAY. 5 said planes irrespective of Wear, a tiltable Witnesses:

film-frarne and inicrometric adjusting con- RIGHD. HENRY GREENE,

nections between said film frame and rod. H. DONALD HOLMES.

Copies of this patent may be obtained or five cents each, by addressing the Commissioner of Patents, Washington, D. G. 

